Not a book, but a play: "Descartes and Pascal", about a historical encounter of these two mathematicians. It was in part translated into Polish and I remember reading it in this version. I could not recall the name of the author. Googling gives Jean De Clouse, by a reference to a stage version in Marathi:
Written by Jean De Clouse and translated into Marathi by Madhuri Purandare, the play's subject derives from a historical meeting between philosopher-mathematician Rene Descartes and Blaise Pascal, a mathematician, physicist and philosopher himself. This meeting took place on 23rd September 1646.
If someone could confirm or correct the authorship or/and the title, he/she is welcome. There are other reference references to the meeting on the web, but not to the play: